general: Add headers explaining the renamed config_*.h

makepanda/makepanda.py

@@ -3668,6 +3668,7 @@ if (not RUNTIME):
   OPTS=['DIR:panda/src/putil', 'ZLIB', 'PYTHON']
   IGATEFILES=GetDirectoryContents('panda/src/putil', ["*.h", "*_composite*.cxx"])
   IGATEFILES.remove("test_bam.h")
+  IGATEFILES.remove("config_util.h")
   TargetAdd('libp3putil.in', opts=OPTS, input=IGATEFILES)
   TargetAdd('libp3putil.in', opts=['IMOD:panda3d.core', 'ILIB:libp3putil', 'SRCDIR:panda/src/putil'])
   TargetAdd('libp3putil_igate.obj', input='libp3putil.in', opts=["DEPENDENCYONLY"])
@@ -3794,6 +3795,7 @@ if (not RUNTIME):
 
   OPTS=['DIR:panda/src/pstatclient', 'PYTHON']
   IGATEFILES=GetDirectoryContents('panda/src/pstatclient', ["*.h", "*_composite*.cxx"])
+  IGATEFILES.remove("config_pstats.h")
   TargetAdd('libp3pstatclient.in', opts=OPTS, input=IGATEFILES)
   TargetAdd('libp3pstatclient.in', opts=['IMOD:panda3d.core', 'ILIB:libp3pstatclient', 'SRCDIR:panda/src/pstatclient'])
   TargetAdd('libp3pstatclient_igate.obj', input='libp3pstatclient.in', opts=["DEPENDENCYONLY"])

panda/src/pstatclient/config_pstats.h

@@ -0,0 +1,2 @@
+// This file to remain during the whole 1.10.x cycle; remove after that.
+#error config_pstats.h has been renamed to config_pstatclient.h - please update your project.

panda/src/putil/config_util.h

@@ -0,0 +1,2 @@
+// This file to remain during the whole 1.10.x cycle; remove after that.
+#error config_util.h has been renamed to config_putil.h - please update your project.